Our benchmark results for the new Prescott-based Pentium 4 'E' processors are the very definition of mixed. In some cases, Prescott looks very good, but in others, it's slower than current Pentium 4 chips at the same clock speed. The larger caches and architectural tweaks have helped immensely in offsetting Prescott's super-long 31-stage pipeline, but they haven't entirely made up the gap. On balance, Prescotts are slower than Northwoods. I expect Prescott P4s will look relatively stronger over time as SSE3 instructions are adopted and, especially, as clock speeds ramp up.